Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.
Priority LOW 25CWE-640Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- None
- Attack complexity
- Low
- Impact type
- Security bypass
- Confidentiality · integrity · availability
- None · None · Low
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA and GitHub. Impact type from CWE-640.
Summary
Concrete CMS (previously concrete5) before 9.1 did not have a rate limit for password resets.
Why it matters now
Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00727 54th percentileScored 2026-11-07
Fix Fixed concrete5/concrete5 (Packagist): 9.1.0
SSVC decision points
CISA ADP · SSVC 2.0.3
- Exploitation
- None
- Automatable
- No
- Technical impact
- Partial
The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| — | — | all versions | — | No fix listed | CNA |
| — | concrete5/concrete5 (Packagist) | before 9.1.0 | 9.1.0 | Patch available | GHSA-ph6g-6v8w-8p6m |
- — Vendor— Affected all versions Fixed in — No fix listed CNA
- concrete5/concrete5 (Packagist) Vendor— Affected before 9.1.0 Fixed in 9.1.0 Patch available GHSA-ph6g-6v8w-8p6m
CPE configurations NVD · 1
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* | before 9.1.0 | Vulnerable | Concrete CMS |
- cpe:2.3:a:concretecms:concrete_cms:*:*:*:*:*:*:*:* Versions before 9.1.0 Vulnerable ·Concrete CMS
Remediation
- Fix · GHSA-ph6g-6v8w-8p6m concrete5/concrete5 (Packagist) Fixed in 9.1.0 Advisory →
Timeline
- 2026-10-02 Threatist record created from CVE-2023-28821
- 2026-10-03 Alias added: GHSA-ph6g-6v8w-8p6m
References
More Concrete Cms vulnerabilities
- TI-2026-23602 ConcreteCMS v9.4.7 contains a Denial of Service (DoS) vulnerability in the File Manager… CVSS 3.1MEDIUM 6.5
- TI-2023-23992 A Cross Site Scripting (XSS) vulnerability in Concrete CMS from versions 9.2.0 to 9.2.2… CVSS 3.1MEDIUM 5.4
- TI-2023-26495 Concrete CMS before 8.5.13 and 9.x before 9.2.2 allows unauthorized access because… CVSS 3.1CRITICAL 9.8
- TI-2026-14907 Missing authorization in Concrete CMS CVSS 4.0HIGH 8.7
- TI-2022-06200 Cleartext transmission of sensitive information in https://github.com/concrete5/concrete5 CVSS 3.1CRITICAL 9.8
- TI-2021-17294 An issue was discovered in Concrete CMS through 8.5.5. CVSS 3.1CRITICAL 9.8
Sources
- CVE-2023-28821 · CVE Program
- CVE-2023-28821 · NVD
- FIRST EPSS
- GHSA-ph6g-6v8w-8p6m · GitHub Advisory Database · CC BY 4.0
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